Improvement in sawing-machines



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NPEIERS. PHCTo-LITHOGRAPHER, WASHINGTUN. DA C.

INVENTOH ATTEST @anni (tithe RICHARD J. POSTON, OF. MAINV'ILLE, OHIO.

Letters Patent No. 109,343, dated November 15, 1870.

iMPRovEMENT in saremo-MACHINES.

The Schedule referred to in these Letters Patent and making 'narcof the same.

I, Rioni-um J. PosToN, of Mainrille,Warren county, Ohio, have invented certain new and useful Improvements in Sawing-llacliines, ot' which the following is a specification. Y

Nature and Objects of the Iarcaticiz.

ihis invention relates to the class of portable sawing-machines that are capable of being moved from place to place for sawing up felled timber into suitable lengths' for cord-wood, mill purposes, 85e.; and

The irst part of my improvementconsists in a ratchet-feed, for permit-ting the descent at proper inter Yals ot a gravitatiug frame which carries the saw and other-operative parts of the machine, the lowering of said frame being necessary in order that the saw may penetrate the log.

The second part of my improvement relates to a peculiar dogr for attaching the machine to the log which is to besawn.

General Descriptiva n'ithltrjercncc to Ille Drawing,

Figure lis aside elevation of a sawing-machine embodying my improvements, a portion ott-hc pitmau and saw being broken away;

higure 2 is a horizontal section of thc samev in the plane of the saw;

Figure 3 is an elevation oi` the-ratchet-feed and its accessories;

Figure l is a vertical section through the ratchet.- feed; and

Figure 5 is a perspective view ci one of the dogs and its accessories.

The main frame ot the machine consists of four vertical posts, A A', l2 B', which are secured together by horizontal beams U; and tit-ted within the main frame is the secondary or gravitatiug one, l), which is coniined to a vertical path by guide-blocks ll, that embrace the sides et' posts A A, l i, and also of the inner posts l1` li".

Journaled athwart the upper part ot' this gravitating-iramo l) is the driving-shalt i, which carries a large pulley, H, from which proceeds a belt, I, to the small pulley J', which hitter is secured to the countershaft l.

Either or both ends oi' the driving-shaft G may be furnished with cranks g, with which to rotate it.

'lhe counter-.shalt l. provided, at one end, with a ily-wheel, L, and at the other with an arm or crank, M, to whose wrist-pin, in., is connected one end ot' the pitn'ian N, which imparts a reciprocating motion to the saw i). V

.lhc saw is coniined to a proper path by an elongated bearing, l), which projects from the gravitatingiramc, and this bearing passes through the longitudinal slot o of the saw.

This slot is not made parallel with the cutting edge of the saw, but is oblique thereto, as shown in tig. 1, which arrangement t slot imparts such an action to the saw as to insure it being cleaned of dust at every stroke. v

rlhe saw is confined toits bearing I by means of pins p 11.

The gravitating-frame D is lowered a suitable distance, so as to permit the saw penetrating the log, by' the following arrangement et devices:

Journaled within said frame is a shaft, R, to which is securely attached a ratchet-wheel, S, whose retain ing-pawl T and spring t are fastened to a toothed wheel, U, that revolves upon said shaft.

Attached by their lower ends to the shaft R, or to a drum thereon, are two ropes or chains, V V', whose uppercnds are secured to one ot thevhorizontal beams C of the main frame.

When the shaft R is rotated by its winch r, so as to wind t-hc ropes or chains upon said shaft or its drum, the gravit-atiiig-frame is elevated, as shown in figzl. 4

The ,descent of the frame is permitted at proper intervals of time in the following manner:

rllhc toothedwheel U has engaged with it a detent, ln., which projects from a rod, NV, whose inner end is slotted at a', for the reception of a guiding-pin or bolt, d, while the outer end of said rod is maintained in contact with the counter-shaft K, or its eccentric le, by a spring, X.

As soon as the rotation of shaft K brings its cani It in contact with the end of rod W, thc latter is forced bach so as to momentarily disengage its detent u from Jthe wheel U, aud thereby permit the rotation of shaft 1t in such a manner as to uncoil the ropes V Y and Y permit the descent oi" the gravitating-tiame D.

When the eccentric has escaped from the rod NV, the latter instantly resumes its original position and causes the detcnt u to he again engaged with the toothed wheel, and thus arrests its further rotation.

The dogs Y Y, with which the machine is attached to the log to be sawn, are of the represented wedgeshape shown in tiff. 5; and theyare furnished with slots y, that are traversed by rods Z Z', which project from posts A A ot' the main frame.

These dogs are to be driven in until the log is brought up securely against the posts A A', and the shoulder toward the thick end ot' the slots impinge against the bars Z Z'.

The method of attachment is represented in g. 2, in which one of the dogs Y is shown driven home, and the other dog, Y, as in the act of being inserted in the log.

The operation is as follows:

The driving-wheel H, being rotated by winches g,

' scend.

rlhe rod W is maintained in its retracted position only during the time t-he cam L is 'impingingy against its outer end, but the moment said cam has escaped from the rod the latter is instantly. restored to its original position by spring; X, by which act the detent 4u is again engaged with the teeth of wheel U, and the` rotation of sa-id wheel is thereby arrested.

The object of the alternate engagement and disengagement of this deteut with the toothed wheel. is to permit the gradual descent of the gravitating-frame D, so as to feed the saw into the logr as rapidly as the latter is sawn. y

The feed-movemept oi' the gravitating-ii'amc can be arranged in such a manner as to allow said frame to descend with greater or less rapidity, so as to be exactly adjusted for .any kind otosaw or lnmber.

A suilicicnt length ot" rope should he wound upon the shaft lt to permit the lowering of the frame D until the log is sa-wcd completely into, and the rope can be coiled upon said shaft, and the frame elevated while the machine is being shifted to a new position for the purpose of' severing` said log at another place.

lhe ropes V Y and drum R may he omitted and a rack and pinion movement substituted for operating the gravitating-f'rame.

Claims.

gravitating-frame in the manner herein explained.

3.1111 combination with the main frame A of a sawing-machine, the slotted and wedge-shaped dog Y y, and guide-barZ, for-the object. herein explained.

In testimony of which invention I hereunto set my hand.

RICHARD J. POSTON. Witnesses:

WM. BAUER,

lJAMES H; LAYMAN. 

